Vibration sensor

A vibration sensor, which is installed on a test device, comprising:

• a shell, one end is open, the other end is closed surface;
• a cover sheet, bonded to the open end of the shell;
• a copper foil, a lower surface of the copper foil is bonded to an inner bottom surface of the closed surface of the shell;
• a piezoelectric chip, a lower surface of the piezoelectric chip is bonded to an upper surface of the copper foil, and when the test device vibrates, the piezoelectric chip converts a vibration signal into a voltage response signal;
• a cable, a positive electrode is welded on an upper surface of the piezoelectric chip, and a negative electrode is welded on the upper surface of the copper foil, configured to connect to an external detection device and transmit the voltage response signal to the external detection device;
• and
• a lead block, arranged between the piezoelectric chip and the cover sheet, and configured to amplify the voltage response signal.